namespace PkmnLib.Plugin.Gen7.Scripts.Battle;

[Script(ScriptCategory.Battle, "future_sight")]
public class FutureSightEffect : Script, IScriptOnEndTurn
{
    private class PendingStrike
    {
        public IMoveChoice MoveChoice { get; }
        public int Turns { get; set; }

        public PendingStrike(IMoveChoice moveChoice)
        {
            MoveChoice = moveChoice;
            Turns = 3;
        }
    }

    private readonly List<PendingStrike> _strikes = new();

    public FutureSightEffect(IMoveChoice moveChoice)
    {
        AddStrike(moveChoice);
    }

    public void AddStrike(IMoveChoice moveChoice)
    {
        _strikes.Add(new PendingStrike(moveChoice));
    }

    public bool HasStrikeAt(byte side, byte position)
    {
        return _strikes.Exists(x => x.MoveChoice.TargetSide == side && x.MoveChoice.TargetPosition == position);
    }

    /// <inheritdoc />
    public void OnEndTurn(IScriptSource owner, IBattle battle)
    {
        var toRemove = new List<PendingStrike>();
        foreach (var strike in _strikes)
        {
            strike.Turns--;
            if (strike.Turns == 0)
            {
                ExecuteStrike(battle, strike.MoveChoice);
                toRemove.Add(strike);
            }
        }
        foreach (var strike in toRemove)
        {
            _strikes.Remove(strike);
        }
        if (_strikes.Count == 0)
        {
            RemoveSelf();
        }
    }

    private static void ExecuteStrike(IBattle battle, IMoveChoice moveChoice)
    {
        var target = battle.GetPokemon(moveChoice.TargetSide, moveChoice.TargetPosition);
        if (target is not { IsUsable: true })
        {
            battle.EventHook.Invoke(new DialogEvent("move_failed"));
            return;
        }
        var damageCalculator = battle.Library.DamageCalculator;
        var executingMove = new ExecutingMoveImpl([target], 1, moveChoice.ChosenMove, moveChoice.ChosenMove.MoveData,
            moveChoice, battle);
        var hitData = executingMove.GetHitData(target, 0);
        var damage = damageCalculator.GetDamage(executingMove, executingMove.UseMove.Category, executingMove.User,
            target, executingMove.TargetCount, 1, hitData);

        target.Damage(damage, DamageSource.Misc);
    }
}